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HomeAircraftHelicopterAlignT-REX 700N › HN7087 - METAL ENGINE BEARING BLOCK SET
02-05-2010 02:38 AM  8 years agoPost 1
NQNA

rrElite Veteran

USA

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I've been told that the plastic engine bearing blocks should be replaced with the metal engine bearing block set - HN7087. Is this good advice or is this something that could be done after a seasons worth of flying?

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02-05-2010 03:13 AM  8 years agoPost 2
wings19

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Tucson, AZ

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Yes this is good advice. The result is stripped main gears after as few as one flight. Just to add another suggestion, I have been running the G-force adjustable metal bearing block with adjustable engine mounts so I can set the gear mesh. I flew all last summer with no stripped gears. They also have a new M1 main gear out there which will help with this also. If you got an SE kit I believe the M1 gear comes with the kit.

Nick
If the wings are traveling faster than the fuselage, it's probably a helicopter

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02-05-2010 09:46 AM  8 years agoPost 3
gorn

rrElite Veteran

Western Australia

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good advice.
I have been running the Align metal block since the heli was new.
The ONLY time Ive had main gear issues , is when I crash lol.

For the love of the hobby

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02-05-2010 01:42 PM  8 years agoPost 4
Against Gravity

rrVeteran

Pottstown PA

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Se
The Mod1 gear set does not come with the SE. It is a new option that just came out, more for the high powered Elec setups. the metal bearing block can help, I have the Micro heli bearing block and have not striped a gear with over 150 flights.

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02-05-2010 03:05 PM  8 years agoPost 5
kirk

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Northern, Colorado

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I used the plastic bearing block in 4 different 700N's that I have built and none of them have stripped gears??? I am just lucky I guess

Proud to have over 13 pages of Good Guy feedback.

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02-05-2010 03:51 PM  8 years agoPost 6
wings19

rrKey Veteran

Tucson, AZ

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I stand corrected then, I read somewhere that the M1 gears came with the new kits.

Nick
If the wings are traveling faster than the fuselage, it's probably a helicopter

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02-05-2010 05:36 PM  8 years agoPost 7
jschenck

rrProfessor

La Vista, NE.

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My thought when I bought my 700, just run the kit bearing block (plastic) and the kit supplied main gear. If I strip the main gear I will replace the main gear with a -1. If it strips again I'll replace the gear and the bearing block. When I put it together I lightly sanded the bearing block halves where the meet to grab the pinion bearing a bit tighter. I also loctite'd the bearing on the pinion. 5 gallons and some of that is horsing around pretty good with hard bogging stick banging (just not that good of a pilot). Still running the stock original gear and bearing block. No stripped gears

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02-05-2010 05:42 PM  8 years agoPost 8
USNAviationjay

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Houston Tx USA

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We have a solution for you, it’s a multi-part solution so your going to want to see what’s inside.

There have been many complaints posted to the forums about the original Trex-700’s stripping the main gears. After 20 or so flights it has been noted that the main engine bearing block, which is plastic, becomes loose causing the bearings to become warped. Align addresses this issue with the slightly bigger main gears.

Here is the upgrade kit. If you bought a Trex 700 LE kit you are going to find this upgrade already included.

http://www.align.com.tw/shop/produc...roducts_id=3153

But why just on the gears? Tim Jones was seen posting in forums about testing and what he did to solve this issue, he came up with a metal engine bearing block that solved the problem. Align must have got wind of this and released their own metal bearing block. You can find that item here.

You will not find this upgrade included in the Trex 700 LE kit. It’s highly recommended you grab this one too.

http://www.align.com.tw/shop/produc...roducts_id=2824

This says its already there on the LEs.. so which is it?

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02-05-2010 05:56 PM  8 years agoPost 9
djrformcar

rrApprentice

Las Vegas, Nevada USA

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With over a year of flying my 700 with the plastic bearing holder, I haven't had any gear problems. I'll get the new metal one mainly to improve the looks!

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02-05-2010 06:12 PM  8 years agoPost 10
Gernejr

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Miami, Fl

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I'm with djrformcar run -1 and plastic only changed to metal as I love blink lol

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02-05-2010 06:23 PM  8 years agoPost 11
digger123

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suffolk .uk

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plastic bearing blocks dont need replacing been running them for a year very hard with no probs at all.

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02-05-2010 06:30 PM  8 years agoPost 12
misfits0311

rrKey Veteran

Santa Clarita, CA - USA

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My LE kit came with the -1 main gear and plastic bearing block. My wife bought the metal block for me as a gift during the build. I haven't stripped a main gear yet. Although I did have to play with the engine alignment because the starter shaft would not spin freely in the metal blocks. After using the greaser on some new bearings and playing with the alignment, its smooth as silk now. No complaints here.

╘ₒ₲ₒ 6°° ƺƉ ṾЪ∂®

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02-05-2010 06:55 PM  8 years agoPost 13
outhouse

rrVeteran

auburn ca

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I noticed the alloy block holds all my bearings a bit tight.

There loose but no as loose as the plastic block.

from what ive geard you get about 80 hrad flighst out of the plastic and that was my reason for buying the alloy block but i dont dig the bearings being tight

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02-05-2010 11:16 PM  8 years agoPost 14
misfits0311

rrKey Veteran

Santa Clarita, CA - USA

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Mine were really tight too. It felt as though the inner ring of the bearings were being pulled toward each other, more so than the outer ring. The reason I put in new bearings is because the inner ring on the original ones spun on the starter shaft and started making a whining noise. I took them apart and found the above mentioned problem which was evident by the discoloration. After is used new bearings that were packed with grease from the greaser and I messed with the engine alignment to get it turning smooth, I have not had any further problems.

╘ₒ₲ₒ 6°° ƺƉ ṾЪ∂®

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02-06-2010 07:12 PM  8 years agoPost 15
NQNA

rrElite Veteran

USA

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It looks like the best idea is probably to replace the bearing block. I ordered one of the bearing block sets and the Metal Tail Rotor Control Arm Set HN7086.

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02-06-2010 07:49 PM  8 years agoPost 16
Tommy8275

rrVeteran

Mount Juliet, TN

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I been run G force with adjustable about 50 hard flight have no problem now I have been stripped over 10 time in one month. going back to the stock (plastic) have only 5 flight and stripped again this week. Now Im waiting for a new version with -1 ( Not the M1)hopefully will help

Tommy K

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02-06-2010 08:43 PM  8 years agoPost 17
CNCjunkie

rrVeteran

Kauai (The Garden Isle), Hawaii - USA

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Here is the upgrade kit. If you bought a Trex 700 LE kit you are going to find this upgrade already included.

http://www.align.com.tw/shop/produc...roducts_id=3153
I just picked up a 700LE kit which has the 780 gyro. It does not have the MOD 1 gears or pinon.

Just another crappy day in Paradise....Aloha!

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02-06-2010 09:43 PM  8 years agoPost 18
digger123

rrApprentice

suffolk .uk

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..

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02-07-2010 12:12 AM  8 years agoPost 19
NQNA

rrElite Veteran

USA

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+1 for CNCjunkie.. My new 700 LE also does not have the new mod gears..

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02-12-2010 10:28 PM  8 years agoPost 20
RussJ

rrApprentice

lockport, new york usa

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I put the metal bearing block on mine and the meatal tail control arm from align only because it looks nicer but I dont think it is really needed. Although in a crash or something it would hold up better than plastic. If you take care in assembling the plastic bearing block you should be ok. I never had a problem with mine.

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